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With the exception of the ruins depicted as Structure No.27,the inventoried buildings have <br /> been protected by the retention of solid coal pillars of 300-foot radius beneath each of the <br /> potentially affected buildings. <br /> The operator's strain projections anticipated potential, repairable damage (non-material <br /> damage)to the two existing water pipelines,the Stevens Gulch Road, assorted trails,ponds, <br /> and springs within the permit area. In each case, a preferred repair methodology has been <br /> presented within the Subsidence Repair Handbook portion of the PAP (Volume 3). <br /> Calculations were included in the permit application to demonstrate that adequate water <br /> storage exists in the Pitkin Mesa Pipeline water distribution system to assure adequate <br /> water supplies in the event of a subsidence related disruption to the pipeline. The company <br /> did not propose to mine pillars beneath the Pitkin Mesa Pipeline. Only development <br /> mining of main entries were to occur under the pipeline and the Stevens Gulch Road within <br /> the Stevens Gulch buffer zone and no subsidence was projected. BRL submitted a pipeline <br /> repair plan, signed by Pitkin Mesa Pipeline Company, as a condition of the approval of <br /> Technical Revision No. 19. <br /> Technical Revision No. 22 modified the coal lease and permit boundary to the west. The <br /> revised permit boundary included areas in the Long Draw Drainage. Upper Cabin Spring, <br /> water supply for Stucker Mesa Domestic Water Company, is located in the upper reaches <br /> of this draw. BRL submitted to the Division a signed copy of a water replacement plan <br /> agreement between BRL and Stucker Mesa Domestic Water Company (see PAP, <br /> Volume 1, Section 2.05.6(3)). <br /> Subsidence Monitoring Program <br /> BRL maintains a subsidence monitoring program for the Bowie No. 1 Mine. Originally, <br /> the program consisted of four components: visual inspection;wide-spaced grid subsidence <br /> monuments;closely spaced,high-resolution subsidence monuments; and the monitoring of <br /> specific buildings and structures. However, with the suspension of mining operations in <br /> December of 1997,the subsidence monitoring program has been reduced in size and scope <br /> and currently entails periodic visual inspections. <br /> BRL received approval to suspend the wide-spaced grid subsidence monitoring program. <br /> Monitoring stations No. I through No. 27 had comprised a wide-spaced monument grid on <br /> approximately 1,300-foot centers east-west and 2,600-foot centers north-south. These <br /> monuments provided general observations regarding the magnitude of vertical subsidence <br /> occurrences. Additional wide-spaced monuments No. 70 through No. 87 had been <br /> installed above proposed mine workings adjoining the old east portals. Monuments with <br /> the notations of some of the DH-50 series, DH-60 series, and the 90 series had been <br /> installed above the underground workings at the West Mine. Several of the 90 series sites, <br /> 94, 96, 97 and 98, had been located on structures owned by the Grosse-Rhode Ranch. <br /> The high-resolution subsidence monitoring program has been suspended. A number of <br /> high-resolution, closely spaced subsidence monuments had been installed in sites selected <br /> 39 <br />